Mortising-chisel



(No Model.) 2 Sheets-Sheet 1. B. W. PETERSON & J. W. OONNELLY.

I MORTISING CHISEL.

N. rnsns. mum-mm nmr, walnii lm. n. c.

(No Model.) 2 Sfieetr-Sheet 2. B. W. PETERSON 82; J. W; CONNELLY.

MORTISING CHISEL. No.- 339,8'06. Patented Apr. 13, 1886.

UNITED STATES 'ATENT OFFICE.

BENJAMIN \VALKER PETERSON AND JOHN \VILSON CONNELIIY, OF \VHEEL- ING, VEST VIRGINIA.

MORTlSlNG-CHISEL.

SPECIFiCA'IlON forming part of Letters Patent No. 339,806, dated April 13, 1886.

Application filed August 5, 15 85. Serial No. 173,610. (No model.)

To ctZZ whom it may concern:

Be it known that we, BENJAMIN WALKER PE'rERsoN and J OHN WVILsON CONNELLY, citizens of the United States, residing at \Vheeling, in the county of Ohio and State of \Vest Virginia, have invented certain new and useful Improvements in Cutting Attachments for MortisingMachines; and we hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which- Figure l is a perspective view of the bit or chisel of a mortising-niachine provided with ourimproved gain-cutting attachments. Fig.

1 2 is a side elevation, and Fig. 3 an end elevation, of the same. Figs. 4, 5, and 6 are detached views of the bits or chisels peculiar to the attachment. Fig. 7 isa view of a portion of a box window-frame pulley-stile, showing the work of the cutting attachment. Fig. Sis a view showing the operation of the tool, the

- full line showing its first direction and the dotted lines its reversal.

Like letters refer to like parts wherever they 2 5 occur.

The object of the present invention is to provide cutting attachments for the bits of the ordinary vertical niortising-machines employed in mortising the pulley stiles of window frames, the lock-stile of doors, and like places where it is necessary or desirable to surround the mortise with a gain or housing for receiving the flange of a lock, pulley-box, or like article; and it consists, generally stated, in a clampi ug- 3 5 stock adjustable on the bit of the mortisingmachine, and provided with a forward or leading bit and an intermediate bit, the whole adjustable on the bit of the mortising-machine, so as to cuta housing or gain of any required length, width, or depth simultaneously with the cutting of the mortise and with a single reversal of the tool.

Heretofore, so far as we are aware, all attachments for a like purpose have demanded a 5 special construction of the main bit or chisel of the mortising-machine, and have either lelt a portion of the gain to be cut by the ordinary hand-tool or necessitated the unnecessary enlargement or lengthening of the mortise and several reversals of the tool to avoid the necessity of hand-finishing the gain. Our devices are simple, efficient, avoid these several objections, and are adapted for use with the bit of the character commonly used in mortisingmachines.

Ve will now proceed to describe our invention more specifically, so that others skilled in the art to which it appertains may apply the same.

In the drawings, A indicates the ordinary cutting-bit used in mortisingmachincs.

B is the improved stock or attachment which carries the gain-bit. a slot, I), through which passes the bit A, so that the stock is vertically adjustable 011 the bit, and can be raised or lowered to vary the depth of the housing or gain to be cut.

E indicates a clamp-screw for securing the stock B.

The forward end or beak of stock B is recessed, as at c, to form a seat for the forward or leading bit, and is also recessed within the slot 1), as at c, to form a seat for the intermediate bit.

A clainp'screw, F, is used for holding the leading or forward bit, whiletheintermediate bit is'held by being clamped between the stock B and the bit A of the mortising-machine.

G indicates the forward bit, which is provided with a hole, 1 for the passage of clamping-screw F, and 1) indicates the intermediate bit, which is preferably cut out, as at (1, so as to straddle the mortise. As a preferred construction, both bits G and D are formed with shoulders e, or, in other words, are wider than the slots in the stock B, so as to bear firmly on and be held steady by the stock.

In securing these devices to the ordinary mortising-machine the stock B is slipped on the bit A, and adjusted to the proper height thereon to give the desired depth of gain, the intermediate bit, D, is inserted between the stock B and bit A, and the set-screw E is tightened to secure the parts. The forward or leading 'bit,G,is then secured by its clampscrew F. The cutting-edges of bits D and G must be set even; but they can be adjusted so as to out gains Ii any required depth or width.

H indicates the gain when cut, and I the mortise.

This stock B has i The devices will operate as follows: In Fig. 8 the full lines represent the initial positions of the mortising-tool and the cutting attach-- the tool is reversed the intermediate bit or' chisel, D, will, as shown in dotted line, set back of the gain out or line 00, and as it advances will commence at the line 00 or edge of the uncut portion. It will thus be seen that a single reversal of the tool will cut the housing orgain completely, which cannot be done by any" other attachment now known or employed for cutting housings or gains.

We are aware that prior to our invention an auxiliary gain-cuttingchisel has been combined with a mor-tising-chisel, and do not, therefore, broadly claim such a combination; but,

Having thus described the nature and operation of our invention, what we claim, and desire to secure by Letters Patent, is-

1. In a gain-cutting attachment for mortising-machines, the combination, with a bitstock which is adjustable on the main or slottingbit ofthe machine, ofa leading or gain bit and an intermediate bit adjacent to the main bit, substantially as and for the purposes specified.

2. In a gain-cutting attachment for mortis I ing-machines, a bit-stock having a slot and clamp-screw for securing the stock to the main bit of the mortising-machine, and provided with a recess or bitrseat for the reception ofan I dered leading or gain bit, G, substantially as and for the purposes specified.

4. In a gain-cutting attachment for mortising-machines, a leading-bit and an intermediate straddle-bit, in combination with an adjustable bit-stock provided with clamp-screws, (the straddlebit being clamped between the bit-stock and the main or slotting bit of the machine) substantially as and for thepurposes specified.

In testimony whereof we affix our signatures, in presence of two witnesses, this 10th dayof July, 1885.

BENJAMIN WALKER PETERSON. JOHN WILSON OONNELLY.

\Vitnesses: I

W. F. PETERSON, CHAS. P. HAMILTON. 

